EP 1389817 A1 20040218 - Method and circuit for detecting a torque variation of an electric DC motor
Title (en)
Method and circuit for detecting a torque variation of an electric DC motor
Title (de)
Verfahren und Schaltung zur Erfassung von Drehmomentschwankungen eines elektrischen Gleichstrommotors
Title (fr)
Méthode et circuit pour la détection des variations de couple d'un moteur DC
Publication
Application
Priority
EP 02425488 A 20020726
Abstract (en)
A method for detecting variations of the torque of a DC motor particularly suited for detecting an accidentally block of the motor, comprises the operations of generating a first signal representing the current flowing in the motor, multiplying the first signal with a pre-established function producing a product signal, generating a comparison signal to correspond to the slope of the product signal and signaling a torque variation if the comparison signal surpasses a certain threshold. <??>The method is implemented by a control circuit for detecting a torque variation of an electric DC motor, comprising sensing means of the current flowing in the motor, generating a first signal, first circuit means for generating a product signal of the first signal by a pre-established function, second circuit means for generating a comparison signal to correspond to the slope of the product signal, a comparator of the comparison signal with a certain threshold, signaling a torque variation when the comparison signal surpasses the threshold. <IMAGE>
IPC 1-7
IPC 8 full level
H02H 7/085 (2006.01)
CPC (source: EP US)
H02H 7/0851 (2013.01 - EP US)
Citation (search report)
- [XA] GB 2237658 A 19910508 - ELECTRONIC COMPONENTS LTD [GB]
- [X] US 5977732 A 19991102 - MATSUMOTO TAKASHI [JP]
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
DOCDB simple family (application)
EP 02425488 A 20020726; US 62741403 A 20030725